DIY FIX: Backlight damage causes iPhone 6 won't boot

 Today, we will share a iPhone repair guide that how to DIY fix backlight damage causes iPhone 6 won't boot. When we supply power to iPhone 6 with C48 MFI USB Cable, the iPhone always shows black screen. Let's learn to diy fix it!

Connect iPhone to DC power supply, we find current 80mA circularly run while connecting and triggering, so maybe it's USB damgage cause I2C short circuit during charging process, first remove the iPhone 6 motherboard and take the USB off, but it's still the same as before, then we measure the I2C resistance and power supply! It is found that the I2C 0SCL is in a short circuit state. As shown in picture 11-10-1.

Since it's short circuit, it means the connected chip is damaged, the connected chips have display, backlight, main power supply USB and the iPhone 6 CPU.

First observe with VGA Camera 7-45X Trinocular Stereo Microscope, it is found that all the backlight diodes are burning and discoloring.

Then remove the backlight first, it does not short-circuit. The trigger current is normal, so continue to replace the 3 piece of iPhone backlight chips.

According to our past experience, if the large inductors gets discoloring, the large inductors with connected iPhone backlight IC would also have problems, so we replace them together. As shown in picture 11-10-2.

Measure it again with DC power supply, now the current is back to normal.  At last, instal the USB, and turn on iPhone, it runs smoothly and successfully. Keep going to check other functions, all is fine. The repairs end!